Process for elimination of coloring-matter from paper-stock.



UNITED STATES PATENT ornrcn.

MELVIN n. HUBBARD, or UTIGA, NEW YORK.

IPROCESS FOR ELIMINATION OF GOLORING -MATTER FROM PAPER-STOCK.

No Drawing.

To all whom it may concern:

Be it known that I, MELVIN H. HUBBARD,

a citizen of the United States, residing at -Utica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Processes for Elimination of Coloring-Matter from Paper- Stock, of which the following is aspecification.

This invention relates to improvements in processes for the elimination of coloring matter from paper-stock in the conversion of the same into pulp; and an Object of this invention is to provide a simple, reliable and ellicient process of the characterdescribed.

Another object of this invention is toprovide a process of the character descr1b'ed which will result in the production of pulp which will be thoroughly cleansed of all impurities, which will be sanitary and hygienic in character, which will possess body and in which the original fiber of the paper-stock will be preserved.

A third object of this invention is to pro.- vide a process of the class referred to which will result in the production of pulp having great density.

My new process is particularly welladapted to the elimination of ink and other coloring matter from newspaper stock in the conversion of the same into pulp; but it v is'not limited to this specific use.

.My inventionis carried out as follows: The paper-stock, which may consist of old newspapers books and like pri'ntedmatter, is placed inla beating engine of the ordinary type and. is there beaten u fine. perature of the mixture 0 stock and water in the beating engine is raised, during the time the stock is being subjected to the h ating operation, to betweenei hty degrees and one hundred and twenty egrees, Fahren-v heit. After the stock hasbeen beaten up fine, and has been reduced to the. consistency of pulp, the following solution is added, namely: Ten (10) parts of soap; twent (20) parts of whiting; and seventy (70% parts of'water. The pulp is nowbea'ten until this solution has thoroughly permeated every portion of the mass and has thoroughly removed and separated the coloring matter, ink and carbon from the particles of paper-stock constituting the body portion of the pulp. The coloring matter, ink and The teni- Specification of Letters Patent. Patented Nov, 29, 1910, Application filed April 9, 1910. Serial No. 554,516. '7

carbon are then partially washed away by the introduction of clear water into the beating engine. To, wash the mass thoroughly free from the separated coloring matter, ink and carbon, the pulp is now run from the beatin engine into a vat provided with a suitab e agitating apparatus by which the mass is kept constantly stirred and moving in the vat. to time with clear water and this water is then drawn ofit', thereby washing the mass. This operation of refillinglwith clear water and drawing ofi' the water is repeated as often as may be necessary to remove the impurities from the stock. It will be understood byall those skilled in this art that, if necessary, more than one washing vat may The latter is filled from time.

be used in order to rid the stock thoroughly of the carbon particles and other impurities; and, if the amount of coloring m 'atter in the original stock be'small or if time be deemed not an essential factor, the washing vat may be entirely dispensed with and the entire washing be carried out in the beating engine.

To the now thoroughly-washed pulp is added a solution consisting of one part of commercialchlorid of lime and three parts of water and this solution is thoroughly mixed with the pulp by means of the agitating apparatus with which the washing vat is equipped; or, if the mixing be done in the beating engine, the mixing will result from the operation of the ordinary beater-roll.

After the pulp is thoroughly bleached, it is again rinsed or Washed with clear water, until'it is thoroughly clean. The pulp will now be found to'be free from disease germs and tobe of a clear White color and will be adapted for use in making paper or any article to the manufacture of which paper pulp may be adapted. To make paper, the washed mass is emptied into a chest; and, after being mixed with wood sulfite, it is run through a Jordan engine and then out upon a paper machine, in the ordinary man-v her. If a grayish color is desired, the washing rocess wlllyof course, be stopped before all t eink and carbon particles are removed and a less quantity of the chlorid solution will be use While I prefer to use, as a bleaching a ent, chlorid of lime, other well-known b caching agents may be substituted thereinvention; thus, a ten per cent. solution of WhileI have herein proportions may I which ordinarily sulfuric acid maybe used.

specified certain definite proport-ionsin which the ingred ents enter the solutions hereinbefore mentioned,

be added to the soap-making ingredients.

I claim:

2 1. The process of removing coloring matter from paper-stock, which consists in reducing the latter to pulp; :20

treating the pulp witha compound consisting of soap and an earthmixed in water; and then bleaching.

2. A'step in the process of removing coloring matter from paper-stock, which consists in reducing the latter to pulp; and treating the pulp with a compound consisting of soap and whiting mixed in water.

3. The process of removing coloring matter fromQpaper-stock, which consists in reducing the latter to pulp; treating the pulp earth mixe with. a com ound consisting in water; an solution of chlorid of lime.

4. The process of removing coloring matter from pa er-stock, which consists in reducing the atter to pulp; adding to the pulp a mixtureof soap, whiting and water; washing the pulp thus treated; and finally addin a bleaching agent.

5. he process of removing coloring matter from paper-stock, which consists in reducing the latter to pulp; adding to the pulp a mixture of soap, an earth and water; washing the pulp thus treated; and finally addin a bleaching agent. '6. %he process of removing coloring matter from pa er-stock, which consists in reducing the atter to pulp; adding to the pulp a mixture of soap, whiting and water; washing the pulp thus treated; and finally adding a solution ofchlorid of lime.

.In testimony whereof I hereunto set my hand this eighth day of April, 1910, at New York city, N. Y., in the presence of the two undersigned witnesses.

MELVIN H. HUBBARD.

then adding a Witnesses:

JAMES HAMILTON, EMMA I. MCCARTHY.

of soap and an 

